Preparation of zinc oxide/silver NPS and the effect of solution Ph on photodegradation of methyl orange dye / Nur Dalila Rosli

Silver zinc oxide nanostructure were synthesized by the sol-gel method using
conventional Hexamethylenetetramine (HMTA) reagent as the reducing agent.
The as-prepared photocatalysts were characterized by XRD, EDX and FESEM.
The doping of Ag was verified by the shifts in the XRD peak of the zinc oxide
and also using EDX analysis. The average crystallite size of ZnO and Ag/ZnO
were calculated to be 84.14 nm and 84.20 nm respectively. The photocatalytic
activity was also evaluated for the degradation of methyl orange under UV
irradiation. The effect of different pH in a range of 4 -11 of methyl orange
solution were studied using ZnO and Ag/ZnO as catalyst. The evaluated
photocatalytic activity shows a rapid degradation of methyl orange solution was at
pH 11 which is in alkaline medium with degradation efficiency of 82 % and 98 %
for ZnO and Ag/ZnO, respectively. This study shows that the degradation of
methyl orange for Ag/ZnO was greater compare to pure ZnO samples towards
alkaline medium.